苯是大气中常见的挥发性有机化合物，它能溶于大气水滴、云雾等水相中，与水相中的过氧化氢在太阳光的照射下会发生液相光氧化反应。利用自制的液相反应装置研究了羟基启动苯液相光氧化反应，利用傅里叶变换衰减全反射红外光谱仪测量了液相反应产物的分子官能团，定性分析了产物的化学组分。实验结果表明，在没有过氧化氢存在时，在光照3 h后，苯溶液的红外谱图中含有苯环C-H和C=C双键伸缩振动吸收峰官能团，溶液中仅存在苯有机物，没有新产物产生。苯和过氧化氢的混合溶液在紫外光照3 h后，反应产物溶液的红外谱图除了含有苯环C-H和C=C双键伸缩振动吸收峰外，还含有O-H和C-O-C键的伸缩振动吸收峰，表明羟基启动苯液相光氧化反应形成了酚类化合物和芳香醚产物。这为研究苯液相光氧化机理提供了实验依据。

Benzene is a volatile organic compound commonly found in the atmosphere. It may dissolve in water droplets, clouds and other aqueous phases. Under the irradiation of sunlight, it can undergo photooxidation reaction with the hydrogen peroxide in the aqueous phase. OH-initiated aqueous photooxidation of benzene is studied by a home-made aqueous reaction apparatus. The molecular functional groups of aqueous reaction products are measured by a Fourier transform attenuated total reflectance infrared spectrometer. The chemical components of the products are analyzed qualitatively. The experimental results show that in the absence of hydrogen peroxide, the infrared spectrum of the benzene solution after 3 hours of irradiation contains the stretching vibration absorption peaks of C-H and C=C of benzene ring. There are only benzene organic compounds in the solution, and no new product is produced. When the mixed solution of benzene and hydrogen peroxide is irradiated with ultraviolet light for 3 hours, the infrared spectrum of the reaction product solution not only has the stretching vibration absorption peaks of C-H and C=C of benzene ring , but also contains the stretching vibration absorption peaks of O-H and C-O-C bonds. These results show that OH-initiated aqueous photooxidation of benzene can form phenolic compounds and aromatic ether products. This provides experimental evidence for the study of aqueous photooxidation mechanism of benzene.